Enhanced two-electron oxygen reduction via Lewis acidic aluminum sites and heterostructures in a nickel–aluminum layered double hydroxide/carbon nitride catalyst

Abstract

NiAl-LDH/CN heterostructures, featuring Lewis acidic Al sites, were synthesized as highly efficient catalysts for the two-electron oxygen reduction reaction (ORR). Al sites enhanced the two-electron ORR activity, achieving an 87% selectivity for H₂O₂ and an H₂O₂ yield rate of 1710 mmol g_cat⁻¹ h⁻¹ in an H-type electrolytic cell.